Hah! Funny. I'd never heard of it before. I don't think it's the best choice of careers for me, personally, but I do like looking at maps. But I'm terrible - terrible - at technical diagrams of anything. My brain doesn't seem to do simple graphic representation. It wants to draw what's actually there. I always had to draw the gas tube on the bunsen burner, and then the tap to which it connected, and then the table, coloured to illustrate that the table was wooden, and... Yeah.

And, hee - well, it obviously thought you're very practical. Elevator installer sounds like the sort of job that sounds cool to a five-year-old. :)